• Proceedings of the Korea Society of Poultry Science Conference
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• 2001.11a
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• pp.83-85
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• 2001

This experiment was conducted to investigate the effects of pelleted food waste on performance and meat quality of broiler ducks. One hundred-forty four broiler ducks were divided into 4 groups with 3 replicates per treatment for 5 weeks. Dietary levels of food waste 0%, 25%, 50% and 75% were included in experimental diets Daily weight gain was significantly increased by addition of food waste 25% and .50%, whereas decreased(P<0.05) by addition of 75% food waste. Feed intake were not affected by the pelleted food waste supplementations. Feed efficiency was improved(P<0.05) by the addition 25% food waste, however, there was depressed(P<0.05) by the addition of 75% food waste. Carcass weight was significantly decreased(P<0.05) by the addition 75% food waste. Moisture composition of breast meat were not significantly different by 25% and 50% food waste, however, there was significantly increased by 75% food waste. As the food waste level was increased, lipid and protein composition in beast meat was significantly decreased As the food waste level was increased. pH of beast meat was increased, whereas lightness and redness of meat color were decreased. Cholesterol content was significantly decreased(P<0.05) by addition of food waste. Odor and appearance of sensory evaluation was depressed by addition of food waste, whereas taste of sensory evaluation was improved by addition of food waste. There was no pathological findings from liver, spleen and kidney in slaughtered ducks. The results of this study suggests that pelleted food waste 25% and 50% improved broiler ducks performance and meat quality in broiler ducks.

• Korean Journal of Poultry Science
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• v.12 no.2
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• pp.107-111
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• 1985

This studies were carried out to obtain the information on the establishment of marketing of broilers. The data for these studies were collected from 16 whole sale traders, 25 retail stores, 12 supermarkets and 3 direct-sales stall located at the suburbs of Seoul, Daejon, Gwangju and Busan. 1. Chickens were generally sold and named for a Spring chicken(0.6-0.9kg), a Boiled chicken of ginseng (1.0-l.3kg), a Semi-bro (1.3-l.7kg) or High-bro(1.8-2.1kg) by their body weight, However, those names were not uniform. 2. Since 47.5% of High-bro chickens, 60.0% of Spring chickens and 16.7% of Semibro chickens were used for domestic use and 66.7% of Semi-bro chickens was taken by butchers, it seemed that most chickens except Highbro and Spring chicken were distributed via butchers. 3. In most cases(75%) when the carcasses were sold a exact measurement was taken, but in some cases(18.8%) eye measurement was still used. 4. For the standardization of carcasses, 37.5% of the answered were for that and 50% of them wanted a gradual standardization and 66.5% of the answered wanted chicks sold by parts.

• Korean Journal of Poultry Science
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• v.42 no.4
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• pp.315-325
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• 2015

Recently, livestock breeding is more focused on the meat quality rather than meat quantity, mainly due to the improvement of consumers' income. Among the meat quality traits, meat color is one of very important traits because meat color is the first selection criterion from the consumers in the market. Most of the economically important traits have continuous variations and these are called quantitative traits. the genomic locations affecting these traits are called quantitative trait locus (QTL), which is mostly controlled by many genes having small effects. In this study, the recent QTL and candidate gene studies were reviewed in order to meet the consumers' demand for the future market. In the chicken QTL database, three traits are related with meat colors, namely breast color (Bco), meat color (Mco), drip loss (DL) and pH. The identified number of QTLs is 33 from 13 chromosomal regions. In these QTL regions, 14 candidate genes were identified; Eight for meat color (APP, BCMO1, COL1A2, FTO, KPNA2, PSMD12, G0S2, FTSJ3), two for drip loss (AGRP, FTO) and four for pH (GALNT1, PCDH19, DIAPH1, SPP2). These QTLs and candidate genes need to be confirmed and fine mapping is ultimately needed for identification of causative variations. The recently developed chicken resource population using Korean native chicken can be used for the improvement of meat quality traits, which increase the value that needed in the chicken industry.

• Korean Journal of Poultry Science
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• v.38 no.2
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• pp.105-112
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• 2011

This study were investigated the effects of dietary supplementation of ground Kalopanax pictus leaves powder on pH, total phenol contents, DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging activity, TBARS, WHC, shear force, meat color, sensory evaluation, and fatty acid composition of chicken meat. Broiler chicks were fed diets for five weeks containing 0% Kalopanax pictus leaves powder (Control), 0.5% Kalopanax pictus leaves powder (T1), 1.0% Kalopanax pictus leaves powder (T2), and 2.0% Kalopanax pictus leaves powder (T3). The pH and TBARS were significantly decreased by the supplementation of Kalopanax pictus leaves powder compared to the control (P<0.05). The total phenol contents and DPPH radical scavenging activity were significantly increased by the supplementation of Kalopanax pictus leaves powder compared to those of the control group (P<0.05), and especially, T3 was significantly (P<0.05) more effective in improving freshness compared to other treatment groups. The WHC and shear force were not significantly different. CIE $L^*$ and $a^*$ value of treatment groups (especially T3) showed significantly higher value compare to the control, however, no difference in the CIE $b^*$ values was observed among treatment groups. In fatty acid composition, linolenic acid of chicken meat was increased by the supplementation of Kalopanax pictus leaves powder than compared to those of the non-supplementation group. In conclusion, a supplementation of Kalopanax pictus leaves powder was effective in decreasing pH and TBARS, and increasing total phenol contents and DPPH radical scavenging activity.

• Journal of the Korean Society of Food Science and Nutrition
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• v.44 no.11
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• pp.1693-1699
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• 2015

Overall quality of six kinds of commercial broiler breast fillets (A~F) retailed in Korea were examined, including proximate composition analysis, shape profile analysis, pH, color, tenderness, cooking loss, descriptive analysis, and consumer testing. A total of 120 breast meat fillets were purchased at a local market. Overall quality of broiler breast meat commercially available in Korea was found to vary significantly, indicating a broad range of product quality in the marketplace. Moisture content of meat ranged from 74.4 to 76.4%, whereas protein, fat, and ash contents were 21.8~25.2, 0.2~0.8, and 1.07~1.16%, respectively. The pH ranged from 6.2 to 6.4, whereas color values ($L^*$, $a^*$, and $b^*$) were 52.2~57.2, -3.5~0.5, and 8.3~13.6, respectively, among all products tested. Approximately 9% variation in cooking loss was detected depending on the products evaluated, whereas shapes (height, width, and length) of meat were also significantly different (15% variation on average). Product F was proven to be the least tender and least liked by consumers, implying that tenderness is a key attribute determining consumer acceptability of broiler breast meat.

• Korean Journal of Poultry Science
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• v.25 no.4
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• pp.195-202
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• 1998

The present study was conducted to investigate the effects of dietary supplemental dry powder of Rehmannia radix (RR) root on the growth performance and physiological status of broiler chicks. The treatments consisted of corn-soybean meal control diet, and RR 0.5, 1, and 2％ diets. A total of 160 Arbor Acre male broiler chicks were randomly allotted to 16 pens ; four pens per treatment and 10 birds per pen. The growth performance, feed intake and carcass weight did not show any differences among the treatment groups, but feed conversion was significantly lower (P< 0.05) in RR 1％ group than that of the control group. The muscle color was lighter (P < 0.05) in RR lof group than those of the other treatment groups. The blood concentrations of protein, glutamic-oxaloacetic-transaminase (GOT) and glutamic- pyruvic-transaminase (GPT) were not different (P > 0.05) among the treatment groups, but the blood total cholesterol content was significantly decreased (P < 0.05) in RR 2％ group than those the other treatment groups. The blood concentration of sugar was lower (P <0.05) in RR 2％ group than those of the other treatment groups, and hemoglobin concentration was decreased (P <0.05) by addition RR. Crude fat content of thigh muscle was higher in RR 1％ group than those of the other treatment groups, and bone hardness of broiler chicks fed RR was higher (P < 0.05) than that of the control group. The saturated fatty acid content of the thigh muscle tende to be high in control and RR 0.5％ groups, and unsaturated fatty acid content tende to be high in RR 1 and 2％ groups than those of the other treatment groups

• Korean Journal of Poultry Science
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• v.25 no.4
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• pp.185-193
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• 1998

This experiment was conducted to investigate the effect of dietary supplemental Astragalus membranaceus on performance and meat quality of broiler chicks for 5 weeks. Basal diets based on corn and soybean meal contained 21％ crude protein for the first three weeks and 19％ for the rest of two weeks. Four levels of dietary Astragalus membranaceus(0, 0.25, 0.50, 1.00％) were fed in a one way design. There were four replicates of 50 chicks per treatment. Weight gain, feed intake, feed efficiency, blood component, breast meat lipid and protein were measured at the end of experiment. No increased growth rate was observed in chicks fed the basal diet supplemented with Astragalus membranaceus. Chicks fed the diet containing 0.5 and 1.00％ Astragalus membranaceus tended to depress the growth rate. Feed intake of 0.25％ Astragalus membranaceus treatment was significantly lower than control group(P<0.05), Dietary supplemental Astragalus membranaceus improved the feed efficiency compared to the control group, but was not significantly different between them. However, Astragalus membranaceus treatment exhibited decreased serum cholesterol and AST compared to those of control group, but was not significantly different between supplemental groups. Serum hematocrit, triglyceride, phosphate and BUN decreased at 0.25％ Asparagus membranaceous supplementation. Growth hormone and IGF-1 (ng/ml) of chicks fed more than 0.50％ Astragalus membranaceus significantly decreased compared to those of control(P<0.05). The total lipid and protein content of chicks fed 0.25 and 0.50％ Astragalus membranaceus tended to increase, but did not show consistency at more than 0.50％ supplement. The results of this experiment indicated that optimum dietary Astragalus membranaceus level to improve the performance and meat quality of broiler chicks may be less than 0.25％.

• Korean Journal of Poultry Science
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• v.46 no.1
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• pp.11-15
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• 2019

The effects of red yeast rice powder on physicochemical properties of chicken thigh meat sausage were investigated. Control sausages were prepared with 1.2% NPS (nitrite pickling salt). Others samples were prepared with 1%, 2%, and 3% red yeast rice powder and 1.2% NaCl. With increasing red yeast rice powder content, the pH of uncooked and cooked samples generally decreased. In addition, lightness, and yellowness decreased with increasing content of red yeast powder (P<0.05), whilst redness increased with increasing content of red yeast powder in sausage samples (P<0.05). In addition, the samples with red rice powder showed more than 3 times higher redness compared to samples with 1.2% NPS, regardless of addition level. No significant difference in cooking yield among the treatments. The hardness of samples increased with increasing red yeast rice powder content, while the cohesiveness of samples containing red yeast rice powder was less than those observed for the control. Consequently, red yeast rice powder can be used to improve redness in sausages without adverse effect on cooking yield.

• Korean Journal of Microbiology
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• v.41 no.1
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• pp.38-46
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• 2005

To determine the actual hygienic status of domestic chicken meats sold in public markets (conventional markets and department stores), microbial contamination levels (Total cells, Coliforms and Staphylococcal cells) and zoonotic pathogens (Salmonella species, Campylobacter species, Listeria species, and Staphylococcus aureus) isolation tests were conducted. Chicken meats and eggs tested were collected from the conventional markets (Si-Jang) and department-stores located in Seoul and Kyung-gi regions in 1996. In total cells and coliforms contamination tests, chicken meats sold in department stores were much lesser contamination status than those of Si-Jang, but staphylococcal cells level was much more higher than that of conventional markets. Salmonella isolation frequency was investigated as $68.8\%$, but Campylobacter jejuni and Listeria monocytogenes isolation frequency were appeared both $64.0\%\;and\;63.3\%$. In case of eggs sold in public markets, one of S. gallinarum strain $(0.7\%)$ was isolated only on the egg-shell part among the four-hundred and fourty-six. In comparison with foreign imported chicken meats, there were no big differences in microbial contamination status. On the other hand, both Salmonella and L. monocytogenes were isolated only in the chicken wings from Korea and China, but not from U.S.A. This data suggest that more hygienic control system in order to produce the safe and hygienic chicken meats and eggs is need in our country as soon as possible.

• Korean Journal of Veterinary Service
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• v.30 no.1
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• pp.33-42
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• 2007

Fowl cholera(FC), which has been classified as reportable animal disease in Korea, occurred in the backyard farm located in Chungju, Chungbuk province. The farm was not ordinary domestic poultry farm but backyard farm with main cultivation of fruits. The farmer reported unusual mortality of chickens which were grazed in his own fruit farm without any poultry house. There was a lots of opportunities to contact with wild animals including wild birds freely. Clinical signs observed in the chickens were torticolis, mucous excretion from mouth and greenish diarrhea. On the necropsy we found multifocal necrosis on the surface of liver, hemorrhages in the epicardium and ovary and mucopurulent exudates in the joint. The causative agents was isolated from the liver of chickens collected from the farms and identified as Pasteurella multocida using biochemical tests of bacteria. Also, the isolated bacteria were inoculated into specific pathogen free chickens to evaluate the pathogenicity. High mortality and similar pathological lesions compared to those of chickens died in the farm were observed. We report the first case of fowl cholera of the chickens in Korea and further studies are needed to evaluate the serotype, genotype and pathogenicity of isolated Pasteurella multocida.